During and after the war, he treated civilians, some of whom were very prominent individuals. Mary Cassatt, the American Impressionist artist, was one of his patients. He removed her cataracts but, for reasons that are incompletely understood, the results were not good. Before surgery she had suffered from iritis and had had adhesions within her eye. She also had diabetes mellitus, but we do not know the status of her retinas. During the 1920s Borsch took care of James Joyce, the author of the novel Ulysses. A story in the New York Times from 1932 was headlined “Joyce's bad eyes are laid to teeth. Author's troubles have been the result of abscesses, doctors in France believe. He faces operation again.” The article says “Mr. Joyce regained his sight in 1923 through the skill of an American practitioner in Paris, Dr. Louis Borsch, but later his eyes failed him again.”35 In 1929 Borsch, age 56, died in his sleep from heart disease, and Joyce went to Switzerland for further care.